While having used "lightbar guidance" for several years, now is the time to start looking for tru autosteer. We desire generic universal mounting so we can switch between tractors,probably Deere 8640s, 4640s,maybe a Cat Challenger or Stieger Panther or two. Eventually going to fall RZB fert and spring planting with the same units. Do not need auto data transfer by wireless, or other fancy bells or whistles. What is available? And at what price?